Improvement in sewing-machines



" J. & A. w. SANGSTER.

I Sewing Machine.

No. 19,155. Patented Jan. 19. 1858.

'W't eases Inventor's:

. view of the machine complete.

U ITED STATES PATENT OFFICE.

JAMES SANG-STER AND AMOS- w. sn'ncs rnn, on BUFFALO, NEW YORK.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. [9,155, dated January19, 1858.

' T0 (tZZ whom it may concern:

Be it known that we, JAMES SANGSTER and Arms W. SANGSTER, of Buffalo, inthe county ence'being had to the accompanying drawings.

The same letters in Figures 2, 4, and '5 refer to like parts in each.Fig. 1 is a perspective It also represents the feeding apparatus.

A is the feedinghar, which is attached to the frame-work by a screw atthe point G. Its upper part is made of elastic metal, so as to springbackward. The spring-bar F is con nected to the feed-bar A by asmallrod, H. I is a nut for fastening said rod.

Bis a bar, which terminates in an elastic foot-piece, for the purpose ofholding the cloth firmly down on the plate J.

G is a nut formed of six or more squares or fiat surfaces, (it may alsobe made round,) and screws up or down the needle-bar.

The feed motion is given as follows: 'VVhen the needle-bar is ascending,the nut O rubs against the lower part of the bar F and forces itbackward from said needle-bar,-and at the same time, by means of itsconnection with the rod H to the bar A at the point I, it pulls saidfeed-bar A, and thus pushes the cloth (or fabric to be sewed) one stitchahead. The downward movement of the needle-bar allows the bar A tospring backward, so that another stitch will be taken when the barascends again. The length of the stitch is varied by raising or loweringthe nut O by means of the screw upon the needle-bar.

Fig. 2 represents the looper when it is in a position to hold the loopfirmly and to open it properly for the needle to pass through.

A is a piece of fiat metal, (rounded at the 1 point,) which catches theloop. It is jointed,

and swings loosely on the bar or frame B at the point .0.

Z is a cross-piece, upon which the point WV of the bar A rests when theloop is formed. The bar marked B swings back and forth, and is attachedto the plate D at the point E by means of a rivet, around which it ismade movable.

F is a lever, which forms part of the frame B.

J K aretwo pins, projecting upward from the plate D, and operate asstationary guides to the bar A. y I

L is a groove or guide impressed in the plate D for the reception of theneedle.

M is a forked bar, attached to the-frame B at the point N, and is madeto move easily upon the pivot at N. This bar is made elastic, so thatthe points may spring together after being separated.

P is a friction-spring attached firmly to the bar M, as may beparticularly seen by refer ence to Figs. 2 or 4 of the accompanyingdrawings.

G is a lever, which gives motion to the looper and receives its motionby the revolving of an eccentric, as will be readily seen by referenceto Fig. 1 of the accompanying drawings. In that figure the eccentric isattached to and revolves with the shaft R. i S is a rod fastened to theeccentric and at tached to the lever G.

T is a stay or support, upon which the lever G swings at the point U.

T-he looper is worked as follows: When the lever G in Vibrating bringsthe pin H down to its lowest point, as shown in Fig. 4, the frame B isforced back from the needle and the piece A is thrown into a horizontalposition by its upper part rubbing against the pin K, and it issupported in that position by the pin J. WVhen thelever G ascends,the'pin H hits against the lower end of the frictionspring 1?, and inpassing it the pin moves the frame-work at the point E'as a center. Theframe-work B is thus moved forward and moves the piece A between thethread and the needle, thence upward to its point of rest on thecross-piece Z, below which the loop forms, and is held open, as seen inFig. 2. The end of the piece A is made narrower thanthe aperture at V,so that the thread maypass freely at each side of it. When the needledescends, the pin H forces its way downward between the points at X inthe spring-frame M, and thus reverses the action of the looper. Thepiece A is thus made to release the loop, as shown in Fig. 5, and toregain its position, as shown in Fig. 4..

The whole machinery, shown by Fig. 2,

thread and the needle, and it should be so nicely attached to the bar B,and so operated by that bar, that its point will rest against the plateD after it passes between the thread and the needle in its course upwardand till 'it passes onto the cross-piece Z.

We claim* The looper A, in combination with the plate D and thecross-piece Z, substantially as herein described, for the purpose ofcatching the loop and causing it to be formed round the Looper A andheld open in the aperture V for the reception of the needle.

JAMES SANGSTER, AMOS VV'. SANGSTER.

Witnesses:

D. D. BIDWELL,' H. M. GAYLORD.

